Parallax mapping with gimp normal map plugin?

BGE supports parallax mapping, so i made a lil research on it. I found that gimp normal map plugin can generate normal/parallax/relief maps from images… I made parallax map but used in Blender 2.57 it looks like simple normal map. Have anyone got working parallax maps in BGE with gimp normal map plugin?

Parrelax mapping in the BGE was achieved only with the use of custom GLSL code using the GLSL API, someone got close to making a parrelax mapping effect with nodes a long while back but the math is quite complex to set up for an artist.

Thx for clear answer Ace